Automatic relief-valve.



Fien;

earnnr ee'eoreefrie nnmnrmamn.

fsecfieetion of Letters atent.

'esteemed new aisee,

.Application filed ny 236, Serial No. 325,676,

Toad 'whom "it may conceive:

Be it known that l, Nescio. Giannino, e subject of the hing of italy, residing et l'alermo, italy, iave invented' new use fnl improvements in Automat-ic Reliefn Valves, of -which the following is e speci.-

ication. y v

This invention relates to the automatic water exhaust of an automat-1c steam cylinder valve which is particularly adapted for cylinders of compound locomotives.

ln the annexed dra-wings e :term of conform in the usuel manner three chambers Br,

AX, C. The upper chamber E communicates with the slide chamber .of the cylinder by means of e pipe Z) and a passage o. The pipe Z) is iXedto the cover ci the valve by means of hasp screws. .The second chamber A communicates with the one end ot' the cylinder by means vof a passage o which is fastened by the flange Z to the cylinder. The third chamber Cf communicates withvthe atS mosphere by means of a plurality of small holes e which are arranged in the lower part of the valve body A and in the lower cover G.

ln ,the upper cover B a piston f slides tightly'-` and vwhich is provided with two bronze piston rings gfv This piston f -coacts with the double-seated valve h. which is guided in the valve body A bymeans ot' ionr wings 7c. The piston rings gere carried by 'a shell Z which is provided vwith' a. boss m and is held in place by a screw plug n screwed into the piston il VThe other side ot' the valve body 7i, that is, the prolongation oi the toni' wings )'c terminates outside of the body 'c and passes through guides 0, p, a sp1-ing g' and a hasp screw rlhe *spring q is intended to compensate the shocks transmitted by the piston to the valve seats. Thel spring plate y) or guide presseswith e small surface upon a hasp screw or nut 1, sees to prevent the spring g rotating around itself and becoming deformed when the hasp screw is tightened to adjust the tension of `the spring.. fitter having regulated the tension or thespring, the hesp screw yor check nut fr is tightened whereby thespring is held in invariable tension .end thereby 'a regnler working of the'valve is assured. y Un the cover B isi-formed a smell chamber gu which communicates by means of an opening er with the space between the pas sage a and the piston ff. et thelower end this chamber u connected with an `ont-let vby ineens of a smell relief valve y. The

valve g; has the purpose to evacuate the chamber B of the condensed steam et the moment when the regulator is closed, so that at the same time the chamber is lubricated by the oil drawn along with the steam.,

The working of he valve is as follows: When the regulator is' closed the pressure in the chamber B and in the annular passage e ceases. New when the valve Fi opens et. the suction er pressure stroke' of the piston it strikes against the Valve rod of the smell valve jz/ and lifts the seme so that the opening' 'u is placed into communication with the passage While et the same time condensed lsteam can leave the chamber B.

Vilhat. l claim is: ln an automatic relief valve'for steam cylinders, a valve easing divided into three chambers, an upper chamberl adapted for being` pnt into communication .with the steam-chest, the middle chamber adapted to be put into communication with the cylinder, and the lower chamber adapted to be put into communication with. the atmosphere, a piston working in the upper chamber and provided with' adjustable bronze packing, a spring in the lower chamber adapted to relieve the shocks in the valve seats, a double seated valve coperatingpwith the piston, .in

combination with an exhaust valve. communicating with the upper casing portion, y

and adapted to be operated by the piston and the double seated valve substantielly asset forth.

In 'testimony whereof l have signed my name to this'speciilcetion in the presence of two subscribing witnesses.

-NUNZO GMBINO. `Witnessesz DoMiNioo CARUPE,

@nieuwe GAPPADONIA, 

